Image display medium

Abstract

An image display medium includes: a first substrate; a second substrate facing the first substrate; a first bonding layer provided inside at least one of the first substrate and the second substrate; and an insulating layer fixed to the at least one of the first substrate and the second substrate by the first bonding layer, wherein the first bonding layer has a Young's modulus smaller than the substrate formed with the insulating layer and the insulating layer.

Description

BACKGROUND[0001]1. Technical Field[0002]This invention relates to an image display medium having flexibility and in particular to an image display medium having an insulating film inside a substrate.[0003]2. Related Art[0004]Hitherto, an image display medium for displaying an image using charged toner particles of two colors has been available as an image display medium having flexibility such as electronic paper.[0005]The image display medium includes a pair of substrates placed facing each other, a spacer sandwiched between the pair of substrates, and first and second particles different in color and electronic characteristic, filled into internal space between the substrate and the spacer.[0006]According to the image display medium, a dielectric film is provided inside the substrate, whereby damage to the substrate caused by collision of the particles and leakage of charges charged to the particles are suppressed for preventing degradation of the image display characteristic.[000...

AI Technical Summary

Benefits of technology

[0012]a coat layer is formed inside the at least one of the first substrate and the second substrate, and covering at least one of the first electrode and the second electrodes. Accordingly, the first and second electrodes can be protected and a wire break can be prevented. To use a composite polymer with inorganic particles dispersed as the coat layer, the residual stress of the coat layer is suppressed, whereby warpage of plastic film can be prevented and the hygroscopicity of the coat layer is decreased, whereby occurrence of crack of the transparent electrode caused by wrinkles occurring on the coat layer, etc., can be prevented.

[0013]The insulating layer has a thickness of 300 nm or more, and 30 μm or less. If the insulating layer has a thickness of 300 nm or more, it is preferable for ensuring an insulating property. If the layer is thick, the image force lowers and thus it is also preferable for preventing a burn error of display media. If the insulating layer has a thickness of 30 μm or less, it is preferable for circumventing the following problem: Because of excessive thickness, the electrode-to-electrode distance becomes long, the space volume required for obtaining a given electric field strength decreases, and flocculation of particles easily occurs.

[0014]Preferably, the insulating layer has predetermined hardness to prevent a display failure caused by an increase in the adhesive force with drive particles. If the hardness is too low, it is feared that the contact area with particles may increase because of deformation, causing the adhesive force to increase more than necessary.

Problems solved by technology

According to the image display medium, however, to sufficiently suppress the damage to the substrate caused by collision of the particles and the leakage of charges charged to the particles, the dielectric film needs to have a measure of thickness and as the thickness of the dielectric film increases, when bending deformation of the image display medium is performed, etc., it becomes impossible to follow the deformation, causing peeling to occur; this is a problem.

If the hardness is too low, it is feared that the contact area with particles may increase because of deformation, causing the adhesive force to increase more than necessary.

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